There are a few other occasions where it switches to that too, namely when you put at least one ball back in the toy chest in Toys in the Attic Multiball: The notification that your scoring's been multiplied is purple DMD-style dots on a complete black screen.
Undoubtedly, that's because the art and animation haven't been completed for this yet. For that matter, the animation in this is awful. It's that really cheap, stiff rig-based animation I used to see on Newgrounds. (Rig-based animation can be done very well though. There's been some rigging animation done using ToonBoom that's so good, it's indistinguishable from traditional frame-by-frame animation. To my knowledge, shows like Gravity Falls and JoJo's Bizarre Adventure, which both use ToonBoom, will occasionally use the program's rigging options when frame-by-frame is too difficult, too time-consuming, or too expensive.)
I hope later updates improve the animation. Frankly, it's not really that fun to watch. (The animation, I mean.)